My thing with this Oberyn killing is that him dying wasn't a twist at all. He was going up against one of (if not the best) fighters in the world. The Mountain was a beast. An incredible specimen. Oberyn dying was hardly meant to be a twist. Odds were on The Mountain from the beginning. People were just hoping Oberyn could defy them.
The twist was how he died. That he was actually winning this fight yet lost it in the end and to then die by getting his eyes gouged out.
This is small, but i appreciate you actually spelling out the complete names of the character. All these corny ass nick names annoy me way more than they should.